Yes. During the Challenges use:

• “X” to switch between the shown and hidden patch
• “Space Bar” to start/stop playback
• “Right Arrow” to trigger the Submit/Next button

And in both the Challenges and in the Standalone Synth use:

• "V" to toggle the Visualizer
• The row of keys that start with "A" to play the keyboard's white keys
• The row of keys that start with "Q" to play the keyboard's black keys
• The number row to set the range of the keyboard